Method of hydrating lime



Dec. 8, 1925. 1,565.10?

J. P. RICH METHOD OF HYDRATING LIME Filed Deb. 29. 1924 Patented nee. 8,1925.

UNITED STATES 1,565,107 PATENT omen.

.roim 2. men, or SWANTON, vnamonr.

marnon or HYnnArme LIME.

Application gled December 29, 1924. Serial No. 758,772.

To all whom it may concern:

Be it known that I, JOHN P. RICH, a citizen of the United States, and resident of Swanton, in the county of Franklin and State of Vermont, have invented certain new and useful Improvements in Methods of HydratingLime; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains tomake and use the same.

- This invention is a methodof hydrating lime having for its object the elimination of sorting to remove cores and of all grinding; saving in labor and power, and conserving lime which is wasted by the methods now generally practiced; also securing a chemically pure product.

The accompanying drawing represents conventionally one form of apparatus which .may be employed in the practice of the invention.

According to my invention, lump lime,' as drawn from the kiln, is delivered into a receptacle constructed to hold a charge of definite bulk, and this charge is weighed, the ascertained weight being compared with the standard weight of a like bulk of erfectly calcined limefree from cores. he excess weight in the charge to be treated, if any, discloses the exact weight of any unburned lime present. Therefore the weight of each'charge is the basis for determining by calculation the quantity of water'to be added in order to reduce the lime, by the method now to be described, to a fine dry powder.

The measured and weighed charge of lime, with or without cores contained, is fed into a hopper 1 having the discharge spout 2; and piping from a tank 3 is arranged to discharge simultaneously. The- The flow through the dis-.

As is well known, the heat due to slaking 65 x generates steam which penetrates the mass of lime and by its expansive force aids in, splitting and reducing the larger lumps. It also causes the surplus water to evaporate and thereby aids in drying the lime powder. I utilize the excess steam by providing for its access to the incoming charge,

and I thereby accelerate the final result, recover all lime dust carried b the steam, and eliminate the necessity or any exhaust stack. The agitation of the lime brings the water into contact with all its particles while the tumbler action separates any cores present from the lime without any grinding. All cores or stones will accumulate at the bottom of the agitator, whence they may be removed from time to time as necessary or convenient. A trough 6 may be provided 'for their dis osition. Following the heat of slaking or each batch, a jet of compressed air may be in-\ troduced into the agitaton as by a pipe 7 and this compressed air will assist in the rapidse aration of thelime and the cores and in oating the fine particles of lime, and in cooling the mass. The air jet. may be regulated so as to admit to the mixer," the same volume of air as is drawn out car-y rying the hydrated lime by the suction fan 8 located in? the outlet conduit 9, which is also provided with a valve 10 to prevent escape of steam during the heat of slaking. From the fan 8 a dischar e conduit 11 carries the hydrated lime to t e sorting t and storage tanks.

The water added with eachv charge of lime is exactly calculated toefiect complete hydration, and the jet of air impinges forcibly against the cores and. circulates around them so as'to clean them of allparticles m5 of slaked lime, the entire mass being, in a sense, poured through the moving air in the agitator. The product sucked from the agitator is afine powder free from impurities. m

Having fully described my invention what I claim as new and desire to secure by Letters Patent, is Y 1. The method of hydrating lime which consists in adding to a. charge of nnground lime of known weight during agitation a calculated quantity of water'to slake all the lime, continuing the agitation; while admitting a jet of air to assist agitation and separate impurities, and withdrawing by suction the hydrated lime.

" 2. The method of hydrating lime which consists in adding to a charge of unground lime of known weight a calculated quantity of water to' slake all the lime, conducting steam from the reaction-into a succeedingcharge of lime, agitating the slaking lime andadmitting thereto a jet of air to assist agitation and separate im urities, and withdrawing by suction the liydrated lime.

3. The method of hydrating lime which consists in delivering to a rotating agitator a charge of unground lime of known weight and a calculated quantity of water to. slake all the lime, admitting a jet of compressed air to the agitator to impinge upon the mass. whereby the impurities will be sep- JOHN P. RICH. 

